I’ve been asked to load some rounds for an original 1873 in 44-40. If I were to do BP, I’d probably go with 30 gr of FFF Goex, a filler, and a 210 gr soft lead bullet. However, with a valuable antique I’d like to have a good clean and low pressure load with a modern powder. Unfortunately N32C is discontinued. My father in law has 1 lb of Trail boss I could probably convince him to part ways with (I did take his PITA daughter off his hands after all.) Any advice on powder and load data is appreciated.